Sloth is definitely my worst. But I'm sure I "practice" all 7 of them depending on the circumstances. The ones I do least are probably Envy and Gluttony.
Sloth
Because I always sit around on the internet when I should be doing important things, like working on my Steam backlog.
I have an unhealthy mix of them all with a bizarre sloth/pride mix but wrath. Wrath all over. Just well controlled.
Signature by rubah. I think.
I'm definitely guilty of lust and sloth, haha. xD
Sloth, wrath, and lust.
Sloth and gluttony.
although sloth would probably trumph gluttony. Sometimes I'm too lazy to eat.
Recently sloth. But uh, that's not usually how it goes. Pride is usually my #1 sin. :3
Pride is the deadliest sin?
Seven deadly sins - Wikipedia, the free encyclopedia
You can look it up on your own if you want more sources but yes, it's considered the worst because it's the route of all the others, supposedly.
Edit: just scroll down to pride.